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Figure 4<br />

(a) Stereo diagram of the secondary structural elements of IL-1α. Produced <strong>by</strong> Molscript [106].<br />

(b) Stereo plot of all the atoms of IL-1α viewed parallel to the axis of the barrel.<br />

E. Three-Dimensional <strong>Structure</strong> of IL-1Ra<br />

Page 407<br />

The x-ray structure of IL-1Ra was first reported in 1994 [47] and has since been solved <strong>by</strong> x-ray<br />

crystallography and NMR <strong>by</strong> several different laboratories [46–49]. Again, this molecule possesses the<br />

characteristic trefoil fold (Figure 6a) and similar tertiary structures (Figure 6b). The structure is similar<br />

to that of IL-1α and IL-1β with an rms deviation of 1.8 and 1.42 Å, respectively, when considering their<br />

Cα positions (Figure 7a). Structural superposition of these three molecules shows a common trefoil core<br />

(Figure 7b). In the absence of receptor substrate complexes, the comparison of all three structures<br />

combined with mutational studies (see below) is invaluable in obtaining a model of the regions<br />

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